Superficially, Wittgenstein and Heidegger seem worlds apart: they worked in different philosophical traditions, seemed mostly ignorant of one another's work, and Wittgenstein's terse aphorisms in plain language could not be farther stylistically from Heidegger's difficult prose. Nevertheless, Wittgenstein's Philosophical Investigations and Heidegger's Being and Time share a number of striking parallels. In particular, this book shows that both authors manifest a similar concern with authenticity. David Egan develops this position in three stages. Part One explores the emphasis both...